Some armed with two 21-inch (530 mm) torpedoes, possibly in drop collars.

Notes:

First successful indigenous midget submarine

The Yugo class submarine is a class of four midget submarines used primarily for infiltration and espionage by North Korea. The class is so named because it was built to plans supplied to North Korea by Yugoslavia in 1965.

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The Yugo-class is a family of midget submarines which are not all identical. The displacement is either the standard 90 tons of the original Yugoslavian design for the early units, or 110 tons for the later units. Armament is either a pair of 400 mm torpedo tubes (early units) or a pair of 21 in (533mm) short torpedo tubes (later units).

All units have the same range: 550 nautical miles (1,020 km) at 10 knots (19 km/h) on the surface and 50 nautical miles (93 km) at 4 knots (7.4 km/h) submerged.

A variation of the Yugo class has been spotted in La Havana harbour, Cuba. Only a single vessel has been seen,[when?] and it is unknown the actual number of units and the key differences with the original Yugo. Rumored to be named "Delfin", it's unknown if it was built in North Korea, or in Cuba with Korean assistance.